[BLDG-SIM] Modeling VAV Exhaust in PowerDOE

Brian K. Schultz brians at paemail.com
Tue Mar 26 09:58:11 PST 2002

We are trying to use PowerDOE to model Variable Air Volume Exhaust in the
laboratory spaces in a five-story engineering building.  At the same time we
are trying to adhere to the ECB in ASHRAE 90.1, which does not allow
changing schedules.  We have tried to model it by giving these spaces their
own dedicated VAV unit that supplies 100% outside air (so the exhaust will
track the supply), and has a minimum of 4 air changes per hour of outside
air (per fire code).  This seems reasonable, but does not take into account
the instances when a fume hood is completely open and the exhaust rate
exceeds the required supply for the space.

Does anyone have any experience with VAV exhaust?  Any insight would be
greatly appreciated.  Thanks.

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